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Ultimate modulation bandwidth of 850 nm oxide-confined vertical-cavity surface-emitting lasers 2

Ultimate modulation bandwidth of 850 nm oxide-confined verti...

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2nd International School and conference Saint-Petersburg OPEN on Optoelectronics, Photonics, engineering and Nanostructures (SPbOPEN2015)

作者： Bobrov, M. A. Blokhin, S. A. Maleev, N. A. Kuzmenkov, A. G. Blokhin, A. A. Zadiranov, Yu M. Troshkov, S. I. Ledentsov, N. N. Ustinov, V. M. Ioffe Inst St Petersburg 194021 Russia Peter Great St Petersburg Polytech Univ St Petersburg 195251 Russia VI Syst GmbH D-10623 Berlin Germany

Complex influence of photon lifetime (controlled by the mirror loss) and aperture size on the performance of 850 nm InGaAlAs oxide-confined vertical-cavity surface-emitting lasers (VCSELs) with fully doped AlGaAs-based distributed Bragg reflectors (DBR) was investigated. We find a tradeoff between photon lifetime and gain nonlinearity for maximizing the optical bandwidth, leading to the optimum aperture size close to 4-6 mu m. In spite of the reduced photon lifetime (from 4 ps to 1 ps), the excess damping caused by the current-induced self-heating limits the ultimate modulation bandwidth for the given VCSELs design at 2425 GHz. Further improvement in high frequency characteristics can be facilitated by decrease of the heat generation and improvement of the heat removal from the active region as well as by proper engineering of the scattering loss at the oxide aperture while keeping the low capacitance optimizing design of the oxide aperture.

关键词： Surface emitting lasers

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Results and developments from the 12m Davies-Cotton Medium-Sized Telescope prototype for the Cherenkov Telescope Array 7

Results and developments from the 12m Davies-Cotton Medium-S...

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conference on Optics for EUV, X-Ray, and Gamma-Ray Astronomy viI as part of the SPIE Optics + Photonics International Symposium on optical engineering + Applications

作者： Oakes, Louise Garczarczyk, Markus Schlenstedt, Stefan Sternberger, Ronny Schwanke, Ullrich Humboldt Univ Berlin Germany DESY Zeuthen Germany

ISBN: (纸本)9781628417692

The Cherenkov Telescope Array (CTA) will be the next generation ground-based observatory for gamma-ray astronomy, covering an energy range from a few tens of GeV to a few hundred TeV. The CTA project is currently in the design and prototyping phase, the start of construction is planned for 2016. The planned sensitivity of CTA improves on current ground based Cherenkov telescope experiments by about an order of magnitude. In the core energy range this sensitivity will be dominated by up to 40 Medium-Sized Telescopes (MSTs). These telescopes, of a modified Davies-Cotton mount type with a reflector diameter of 12 m, are currently being prototyped. A full-size mechanical prototype has been operating in Berlin since 2012. Several types of prototype mirrors have been developed and tested, and are mounted on the telescope. CCD cameras with various lenses are mounted on the prototype for studying deformation of the structure, testing alignment techniques, and telescope pointing using astrometry methods. The report will focus on results of optical and structural measurements, commissioning and testing of the MST prototype in Berlin, as well as the final design.

关键词： CTA Cherenkov Telescope MST Davies-Cotton

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design AND DEVELOPMENT OF TEN-ELEMENT HYBRID SIMULATOR AND GENERALIZED SUBSTRUCTURE ELEMENT FOR COUPLED PROBLEMS 6

DESIGN AND DEVELOPMENT OF TEN-ELEMENT HYBRID SIMULATOR AND G...

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6th International conference on Computational Methods for Coupled Problems in Science and engineering (COUPLED PROBLEMS)

作者： Mojiri, Saeid Huang, Xu Kwon, Oh-Sung Christopoulos, Constantin Univ Toronto Dept Civil Engn 35 St George St Toronto ON Canada

ISBN: (纸本)9788494392832

The University of Toronto's ongoing work towards the improvement and further development of multi-platform simulation methods is presented in this paper. These developments include a ten-element hybrid simulator and a generalized OpenSees substructure element. Hybrid simulation which encompasses development of new integration algorithms, simulation frameworks, and applications has been an active research area in the past decade. Yet, unless the physically tested element significantly contributes to the overall lateral response of the structure in terms of stiffness, strength and energy dissipation, the improvement in the accuracy of results from the use of hybrid simulation may only be marginal. In most cases, the number of physically tested elements in the hybrid simulation is limited by the availability of experimental resources such as actuators, controllers, and laboratory space. As a step towards overcoming this limitation, a novel experimental apparatus, the UT10 Hybrid Simulator, is being developed at the University of Toronto. The UT10 is being developed to allow up to ten elements, such as braces and hysteretic dampers, to be concurrently tested and integrated into a hybrid simulation. The system can test up to ten physical specimens with peak force capacity ranging between 800 kN or 1,600 kN per specimen depending on the total number of tested specimens. The main design requirements, current development status, and potential applications of the UT10 Hybrid Simulator are presented in this paper. To integrate the potential numerical or physical substructures into distributed multi-platform simulations such as hybrid simulations, a generalized substructure element is being developed for OpenSees. The main research focus in this development is to standardize the data exchange format and communication protocol such that any other potential experimental and numerical substructure modules can be readily integrated into the simulation. The data exchange format is

关键词： Multi-platform Analysis Coupled systems Substructuring Hybrid simulation Pseudo-dynamic testing Dynamic testing

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Fabrication and Performance of UV Photodetector Based on Nanostructure ZnO Thin-Film Deposited by Vacuum Coating Technique

Fabrication and Performance of UV Photodetector Based on Nan...

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International conference on developments in eSystems engineering (DESE)

作者： Ghusoon M. Ali P. Chakrabarti Electrical Engineering Department Al-Mustansiriya University Baghdad IRAQ Department of Electronics Engineering Indian Institute of Technology (BHU) Varanasi INDIA

ISBN: (纸本)9781509018628

The paper reports fabrication, characterization and testing of the thermal stability of Pd/nanostructured ZnO thin-film Schottky diode. The effect of optical power and bias on the performance of fabricated diodes based UV photodetectors has been investigated. ZnO was grown on p-type Si 〈100〉 substrate by vacuum thermal evaporation technique. The surface morphological and the structural properties of the thin-film were studied by scanning electron microscopy and X-ray photoelectron spectroscopy measurements. I-V characteristics of the Schottky barrier UV photodetector were studied and the parameters such as ideality-factor, leakage-current, rectification ratio and barrier-height were extracted from the measured data at room temperature (300K). The study revealed that the performance of the devices has a thermal stability with increasing post metal deposition annealing temperature up to 500°C. For annealing temperatures beyond this temperature the rectification quality of the device degrades drastically. The device exhibited high efficiency and high sensitivity under the reverse bias condition. For forward bias, the UV detection sensitivity decreased proportionally to the bias voltage. At lower level of UV optical power (0.05 to 0.5 mW) the Schottky barrier height and rectification ratio decreased rapidly while at higher level of optical power (5 to 10 mW) these parameters decreased gradually.

关键词： Zinc oxide II-vi semiconductor materials Annealing Thermal stability Temperature measurement Films Schottky barriers

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Detector developments at ESO to Prepare for the E-ELT Era

Detector Developments at ESO to Prepare for the E-ELT Era

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conference on High Energy, optical, and Infrared Detectors for Astronomy vi

作者： Downing, Mark Finger, Gert Ives, Derek Iwert, Olaf Kolb, Johann Ramsay, Suzanne ESO D-85748 Garching Germany

ISBN: (纸本)9780819496225

ESO has a very active on-going detector development program to not only meet the needs of the current crop of instruments for the VLT, but is also actively involved in gathering requirements and developing detectors for the challenging instruments being proposed and in design for the E-ELT. This paper provides an overall summary of the detector requirements of the various E-ELT instruments and the many interesting detector developments ESO is involved in to meet these needs. Most of these instruments and detector developments are described in more detail in other papers at this conference.

关键词： Adaptive Optics Detector HAWAII-4RG AO Wavefront Detector E-ELT Instrument Roadmap ESPRESSO NGSD LGSD L3vision CCD CCD220 CMOS Imager Selex SAPHIRA E-ELT CODEX

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optical design of Low Glare Luminaire Applied for Tunnel Light 15

Optical Design of Low Glare Luminaire Applied for Tunnel Lig...

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conference on current developments in Lens design and optical engineering XV

作者： Tsai, M. S. Lee, X. H. Lo, Y. C. Sun, C. C. Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan

ISBN: (纸本)9781628412192

In this study, a low glare and high-efficient tunnel lighting design which consists of a cluster light-emitting diode and a free-form lens is presented. Most of the energy emitted from the proposed luminaire is transmitted onto the surface of the road in front of drivers, and the probability that the energy is emitted directly into drivers' eyes is low. Compared with traditional fluorescent lamps, the proposed luminaire, of which the optical utilization factor, optical efficiency, and uniformity are, respectively, 44%, 92.5%, and 0.72, performs favorably in traffic safety, energy saving, and glare reduction.

关键词： Light-emitting diodes Illumination design Nonimaging optics optical design and fabrication

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Deadlock-Avoiding vs. greedy spectrum allocation algorithms in dynamic flexible optical networks

Deadlock-Avoiding vs. greedy spectrum allocation algorithms ...

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International conference on Transparent optical Networks

作者： Danilo Bórquez Alejandra Beghelli Ariel Leiva Faculty of Engineering and Sciences Universidad Adolfo Ibañez Viña del Mar Chile Electrical Eng. School Pontificia Universidad Católica de Valparaíso Valparaíso Chile

Greedy spectrum allocation algorithms assign the required number of slots to a connection request as long as there are enough contiguous slots available for it. Instead, a deadlock-avoidance algorithm only assigns slots if future connections can be fit in the spectrum void left after assigning the current connection. That is, a deadlock-avoidance algorithm avoids leaving available slots that cannot be used by a future connection. The mean time required to exhaust the spectrum of a deadlock-avoidance approach has been studied in the context of a single flexible-grid link under incremental traffic. However, such algorithm has not been studied under dynamic traffic, where the blocking ratio is relevant, neither considering routes longer than 1 hop. In this paper we evaluate the blocking performance of greedy and deadlock-avoidance algorithms under dynamic traffic, in routes from 1-hop to 3-hops. Simulation results show that - with respect to a greedy approach - there is no benefit from deadlock-avoidance algorithms in 1-hop routes. However, the deadlock-avoidance strategy achieves up 2 orders of magnitude lower blocking than the greedy algorithm when longer routes are considered. This result highlights the importance of using algorithms that prevent spectrum fragmentation for efficient resource utilization in dynamic flexible grid networks.

关键词： Heuristic algorithms System recovery Resource management Telecommunication traffic Dynamic scheduling Algorithm design and analysis Bandwidth

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Caustic surface of a plane wavefront refracted by a smooth arbitrary surface 15

Caustic surface of a plane wavefront refracted by a smooth a...

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conference on current developments in Lens design and optical engineering XV

作者： Avendano-Aleja, Maximino Univ Nacl Autonoma Mexico Ctr Ciencias Aplicadas & Desarrollo Tecnol Mexico City 04510 DF Mexico

ISBN: (纸本)9781628412192

We study the formation of caustic produced by smooth arbitrary surfaces considering a plane wavefront propagating parallel to the optical axis and impinging on the refracting surface. We have already seen that the shape of the caustic surface can represent the monochromatic aberrations that we call image errors, furthermore the shape of the caustic can be modified by changing the parameters of the lens in such a way that if the caustic surfaces is vanished the optical system produces a perfect image, on the other hand for a caustic possessing a large area it could be applied to design no-imaging optical systems. The shape of the caustic depends only on the indices of refraction involved in the process of refraction, the refracting surface which is formed by smooth arbitrary plano-convex lens. We provide an analytic equation for the caustic surface after refraction of a plane wave from every rotationally symmetric surface.

关键词： Refraction Aspheric lenses Wavefronts Ray tracing optical design Geometrical optics Monochromatic aberrations Light Radon Wave propagation

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Using saddle points for challenging optical design tasks 15

Using saddle points for challenging optical design tasks

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conference on current developments in Lens design and optical engineering XV

作者： Livshits, Irina Hou, Zhe van Grol, Pascal Shao, Yifeng van Turnhout, Maarten Urbach, Paul Bociort, Florian Natl Res Univ Informat Technol Mech & Opt 16 Birzhevaya Line St Petersburg 199034 Russia Delft Univ Technol Optic Res Grp NL-2628CJ Delft Netherlands TNO Sci & Ind NL-2628CK Delft Netherlands

ISBN: (纸本)9781628412192

The present research is part of an effort to develop tools that make the lens design process more systematic. In typical optical design tasks, the presence of many local minima in the optical merit function landscape makes design non-trivial. With the method of Saddle Point Construction (SPC) which was developed recently ([F. Bociort and M. van Turnhout, Opt. engineering 48, 063001 (2009)]) new local minima are obtained efficiently from known ones by adding and removing lenses in a systematic way. To illustrate how SPC and special properties of the lens design landscape can be used, we will present the step-by-step design of a wide-angle pinhole lens and the automatic design of a 9-lens system which, after further development with traditional techniques, is capable of good performance. We also give an example that shows how to visualize the saddle point that can be constructed at any surface of any design of an imaging system that is a local minimum.

关键词： saddle points wide-angle lens

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Afocal viewport optics for underwater imaging 15

Afocal viewport optics for underwater imaging

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conference on current developments in Lens design and optical engineering XV

作者： Slater, Dan 1352 Dorothea Rd La Habra Hts CA 90631 USA

ISBN: (纸本)9781628412192

A conventional camera can be adapted for underwater use by enclosing it in a sealed waterproof pressure housing with a viewport. The viewport, as an optical interface between water and air needs to consider both the camera and water optical characteristics while also providing a high pressure water seal. Limited hydrospace visibility drives a need for wide angle viewports. Practical optical interfaces between seawater and air vary from simple flat plate windows to complex water contact lenses. This paper first provides a brief overview of the physical and optical properties of the ocean environment along with suitable optical materials. This is followed by a discussion of the characteristics of various afocal underwater viewport types including flat windows, domes and the Ivanoff corrector lens, a derivative of a Galilean wide angle camera adapter. Several new and interesting optical designs derived from the Ivanoff corrector lens are presented including a pair of very compact afocal viewport lenses that are compatible with both in water and in air environments and an afocal underwater hyper-hemispherical fisheye lens.

关键词： Afocal lens design underwater photography water contact lens Ivanoff corrector lens dome port hyperhemispherical fisheye lens

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